But apparently when Zac Hanson, the singer-drummer and most popular band member, refused to let one particularly unruly hipster aboard the trio's tour bus at a recent stop in Seattle, the rude dude ended up spitting in the "MMMBop" rocker's face.

"This (expletive) snuck on Hanson's bus then spit on Zac's face. #hanson," wrote a female fan who witnessed the altercation and posted video to her Instagram page.

As it happens, the happily married musician made headlines a month ago after he was caught on video referring to one particularly overzealous fan as a "drunk b-----" after she lobbed sexually explicit come-ons at him during a solo piano rendition of the group's Lulabelle" at a concert in Richmond, Va.

Hanson's trek meanwhile continues with a show in Vancouver Wednesday night.